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去年，一种特殊的手套问世了。
Last year, a special kind of glove came out.
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食品的储存呈现其自身的一套问题。
Storing foods can present its own set of problems.
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在调查中，美国的主治医生们分别收到了两套问卷。
In the survey, two sets of questions were sent to primary care physicians around the United States.
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